Sectional boiler



2 Sheets-Sheet}.

J. G. CURTIS; Sectional Boiler.

(ModeL) Patented July 13,1880.

I ATTORNEYS.

WITNESSES 5.

MPEYERS, FHQTOUTHOGRAPHER. WASH NGTON. D C.

(ModeL) 2 Sh eetsI-Sheet 2.

J. G. CURTIS. Sectional Boiler.

o- 29,964. Patented Jul/3 1B; 18 g.

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ATTORNEYS.

U ITED STATES PATENT Fries. I

JOHN G. CURTIS, OF LUDLOW, PENNSYLVANIA.

SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 229,964, dated July 13,1880.

Application filed April 5. 1880. (Model) To all whom it may concern Beit known that I, JOHN G. CURTIS, of LudloW, in the county of McKean andState of Pennsylvania, have invented a new and Improved SectionalBoiler, of which the following is a specification.

The object of this invention is to provide a simpleand inexpensiveboiler, designed especially for burning wet tan, sawdust, etc, and soconstructed that the tubes thereof may contract and expand withoutstraining the joints, and so that any of the tubes may be removed forrepairs and replaced without disturbing the others. i

Figure 1 is an elevation of the device with the side of fire-chamberremoved. Fig. 2 is a side elevation, partly in section. Fig. 3 is a planof the same with the smoke-stack and top of smoke -chamber removed. Fig.at is a plan of the tube-connection,partly in section. Fig. 5 is a sideelevation of the same, partly in section. Fig. 6 is a horizontal sectionof Fig. 5 on line as .19.

Similar letters of reference indicate correspondin g parts.

In the drawings, A represent the fire-chamber, provided with doors A A.B is the ashpit, separated from the said firechamber by the grate G andprovided with end doors, 0 0. D D are the water and steam tubes,arranged longitudinally within the fire chamber A in several series ofzigzags, as shown, and secured Y therein by having their ends supportedand connected by'the screw joints or couplings E E, which joints orcouplings E E are entered from the outside through the end plates, F F,of said fire-chamber A.

G represents the smoke-chamber or connection, within which is set theupright cylinder H, said chamber G being divided into two parts by thevertical partition h, and being separated from the fire-chamber A by adivision-wall, g, through which is a communicating opening, 9, openingopposite the cylinder H, and serving as a flue to conduct the productsof combustion from one chamber to the other, that said products mayescape by the smokestack I, which extends upward from the top of saidchamber G.

The water-supply pipes K K extend from the front of the chamber A, alongthe ends thereof, between the doors A A and the end plates, F F, to thecylinder H, and are connected at each end of the said fire-chamber A, bymeans of the couplings E E, with the two lower rows of tubes D D, whilethe steampipes L L, that extend from the front of the tire-chamber A, atits top and along its ends, between the doors A A and the end plates, FF, connect on either side with the upper part of the cylinder H, andalso with the two upper rows of tubes D D, by means of couplings E E.Hence, when the device is in operation water entering the pipes K K willflow upward in the tubes and cylinder D D H, and, being converted intosteam, said steam will enter said cylinder H through the said steampipesL L.

M is a smoke-flue, fixed centrally across the top of the tubes D D andaiding in supporting the top of the fire-chamber A, closed at the frontend and entering the smoke-chamber G at about midway between the ends ofsaid chamber. farthest from the flueg with openings m m for the entranceof the products of combustion, and said flue M is designed for thepurpose of creating a more even and central draft than would be obtainedwere the due or opening g the only smoke-connection between the chambersA G.

NN are openings in the top of the fire-chamber A, closed by covers N N,through which the wet tan, sawdust, 850., is fed into the saidfire-chamber, it being designed that said tan, 850., shall fall downupon the tire between the tubes D D. These tubes D D are arranged withinthe fire-chamber A, in the manner herein shown and described, for thepurpose of intercepting as much as possible consistent with a good draftthe heat given off the burning fuel; and it is evident that said fiuesmay be multiplied to produce a boiler of any desired capacity, and thata series or sections of them may be placed on both sides of thesteam-cylinder H. The grate 0 covers the entire surface beneath thetubes D D, thus affording ample fire-surface.

The products of combustion rising from the grate 0 up between and aboutthe tubes D D enter the chamber G through the dues g and M, and aboutthe upright cylinder H, down- This flue M is provided on its side ter,recess, or socket corresponds with the external diameter of the ends ofthe tubes D D, and has formed in it screw-thread 0, for makingconnection with the ends of said tubes D D.

Centrally from the rear of the socket of this cap or thimble O a smallhole, 1;, extends into the ear q, and there connects at right angleswith a transverse hole, 4, formed in said ear g. This hole 12 iscountersunk, as shown, and in the countersink w is inserted a bushing orring, t, of copper or other soft metal, in which an end, beveled ortapering, of the connecting-pipe G is fitted. Parallel with the hole 1',and on either side of it, the holes r are bored for the reception of thebolts S S. These caps or thimbles O O are united and connected in pairs,as shown, by means of the pipe P, bolts S S, and nuts 8 s, and thus forma flexible coupling or joint that when fitted on the tubes D D permitssaid tubes to spring without leaking at the joints. These couplings E Eare also provided on either side with lugs 12 '0, that engage witheither face of the end plates, F F, when the tubes D D are in position,and thereby prevent said tubes D D from moving endwise.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A steam-boiler constructed, substantially as hereinshown and described, with fire-chamher A, series of zigzag tubes D D,outside flexible couplings or joints, E E, outside water and steampipes, K L, cylinder H, and per- I forated smoke-flue M, as set forth.

2. As a means of connecting the tubes D D with the upright cylinder H,the water and steam pipesK L, substantially as herein shown anddescribed, said pipes K L being connected with the two upper and twolower rows of tubes D D, as set forth.

3. In a boiler, the combination, with the zigzag tubes G G, cylinder H,and smokestack I, of the division-wall g, provided with flue 9, verticalpartition H, and perforated flue M, substantially as herein shown anddescribed, whereby the products of combustion are made to circulateabout said tubes and cylinder and escape, as set forth.

4. As a means of connecting a coupling, the tubes D D, and incombination therewith the couplings E E, consisting of a recess orsocketed caps or thimbles O 0, provided with holes 1), perforated earsq, tapering connecting-pipe P, and bolts and nuts S s, substantially asherein shown and described.

JOHN GOULD CURTIS.

Witnesses:

AL. BYHAM, W. H. CHAMBER.

